class_docstr: Indicates no value set, which is not the same as setting ``None``. 
code: def __copy__(self) -> UndefinedType:
      return self
  
file_path: bokeh/src/bokeh/core/property/singletons.py
imports: from __future__ import annotations
  import logging
  from typing import TYPE_CHECKING, TypeVar, Union
label_desc: Use image node_id 1 for calling the UndefinedType obj's underlying member method code with example usage: obj.__copy__() and returns: self